Laktišová, P., and A. Kulla. “INTEGRATING 4C SKILLS OF 21ST CENTURY INTO ESP COURSES AT UNIVERSITY OF ŽILINA”. Apps - Academic Journal of Applied Linguistics and Languages, vol. 2, no. 1, May 2024, pp. 10-17, https://ojs.tuzvo.sk/index.php/apps/article/view/97.